| 摘要 |
PURPOSE:To avoid the effect of the temperature change to the A/D conversion output by adding a simple resistance circuit betwen the band limiting filter and the sample holder. CONSTITUTION:Resistance circuit 15 is inserted between band limiting filter 1 and sample holder 2 to secure an extreme limitation of the effect of the temperature change to the A/D conversion system as a whole. The temperature coefficient can be selected either positive and negatice for the code with the general-use metal film resistance r. Thus, the positice temperature coefficient is selected for r2 and r1 in case the output of filter 1 decreases as the increment of the temperature. Furthermore, the temperature coeffieicnt of r2 is set larger than that of r1, and the difference is matched with the gain fluctuation rate of filter 1. As a result, the input of holder 2 can be kept constant. |
